His nickname is derived from his hairstyle ("permanent"), he is tall and skinny (though his nameless Manga counterpart had quite a fatter form). Perm often displays the most character development, including being the only one of the Stormtroopers to have a visible girlfriend.
Mouri Kogorou is a private detective and Ran's father. Some time ago, he worked in the Tokyo Metropolitan Police Division One with Inspector Megure, but while an excellent marksman he was not a particularly good investigator. Around the time Mouri left the police force, his wife Kisaki Eri also moved out, though they have never officially divorced despite ten years having passed. Mouri has an overinflated sense of his own importance and detective prowess to the point where he doesn't investigate why he is suddenly and consistently passing out at crime scenes and solving cases in his sleep with different deductions than he was making while awake. He is also frequently unprofessional in his work, frequently making sarcastic and blunt comments about suspects or even his own clients. On cases, Mouri is typically lax with his deductions and investigation, following only the most obvious clues or assumptions to reach his conclusions, which are often silly or fall directly into a culprit's trap. The police, especially Megure, often find him to be an embarrassment while awake and hope to see "Nemuri no Kogorou" (Sleeping Detective) as soon as possible. Mouri does have a serious side which only emerges when the case has personal importance to him, such as when Eri and Ran are involved. When this happens, Mouri's entire personality and demeanor changes and he begins acting professionally, demonstrating improved deductive skills and cunning. While he is not up to the standards of Shinichi and he still can have problems with finding clues, his logical reasoning becomes better, and Mouri often demonstrates he has a better sense of interpersonal relationships than Shinichi does. Mouri easily becomes infatuated with beautiful women. His favorite celebrity is pop idol Okino Yoko, and he never misses (or tries not to miss) her television shows. He also keeps a large collection of Yoko related goods and his office and bedroom have Yoko posters. Because of his flirtatious behavior around attractive women, he often embarrasses Ran, and while it is not stated as the reason why Eri left him, it is one of the primary reasons why she hasn't come back. While never outright called an alcoholic, Mouri has a tendency to get intoxicated and Shinichi/Conan often makes sarcastic remarks about him spending money on alcohol. In the anime, particularly in early episodes, his office is littered with empty beer cans, and he keeps a well-stocked liquor shelf. Mouri is also a heavy smoker, and is usually seen with a cigarette in his mouth. Other hobbies include watching his favorite idol star, Okino Yoko, betting on horse races, playing mahjong (which he tends to lose) and playing or watching baseball (he even plays in his neighborhood's team). In the movies, Mouri suffers from a mild acrophobia (fear of heights) and is quite uncomfortable in high settings where he has the chance to see how high up he is. He does not have this fear in the manga.
Lum (also referred to in English dubs as Lamù) is a beautiful Oni alien who is capable of flying and generating electrical shocks. She is extremely popular and is famous for ending her sentences with ~datcha (loosely translated as "yes?" or "you know?"). Except when in her school girl's uniform, she usually wears a sexy outfit consisting of a tiger-striped bikini and knee-high go-go boots. While generally good-natured, sweet, and innocent, Lum also has a very hot temper. Her dream in life is to live in a "Sweet Home with Darling" in which she keeps house and raises babies while Ataru works. Unfortunately, Lum's idea of "cooking" is to take very spicy ingredients like jalapenos, cayenne peppers, and Tabasco sauce and irradiate them with an alien energy bazooka until they carbonize into inedible, crystallized nuggets. As an alien she has access to many bizarre gadgets whose use she really doesn't understand all that well, leading to comedic results. Differences between human and "Invader" physiology also drive many stories, like the time Lum's horns begin to grow larger after she is bitten by a cow, or the time she becomes drunk by eating pickled plums. (Source: Wikipedia)
His nickname is derived from his height ("chibi" means "small" or "short"), he is a timid crybaby, speaks with a cracked voice, and is often beaten up by the rest of the Gang of Four. He is often together with Kakugari. He also has buck teeth like that of a beaver's (though his nameless Manga counterpart did not have this).
Megure Juuzou, commonly referred to as Inspector Megure, is a Police Inspector (Rank 6) in Division 1 of the Tokyo Metropolitan Police Department. He is almost always there on the scene when a murder occurs, always interviewing the suspects, and acting as the commanding officer of the group of police he brings along with him, among them Takagi Wataru, Satou Miwako, Shiratori Ninzaburou and Chiba. Megure is a capable veteran officer who cares much for his underlings, but he is prone to occasional shouting fits whenever something does not go right or when his temper gets the better of him. He also has little patience for fools, but tends to be a bit too conservative, limiting his ability for flexible thinking. Shortly after Megure had come to the police force, he was involved in a case in which he would meet his future wife, Midori. As a result of the case, he has taken to wearing a hat in public in order to hide a scar which he gained and his own self-consciousness about how he came to his marriage. Megure was also a good friend of star detective story novelist Kudou Yuusaku, and would in the past consult him about one case or another. On many such occasions, Yuusaku would take his son Shinichi with him, who would pick up his father's investigative skills and eventually become a detective in his own right. After Shinichi solved their first mutual case for him, he has regularly consulted him in difficult cases and considered him a great help. In stark contrast to this, he tends not to think much of Conan and the Detective Boys, usually thinking of them as a nuisance until they solve the ongoing case for him. Likewise, from their common police days, he has no high regard for Kogorou, and he thinks that he may actually be under some kind of jinx, since wherever Kogoro shows up, there is always some murder case nearby (a fact which actually conforms to Conan, which in later cases he seems to have realized). In some anime originals, Megure has the habit of trying to tell the culprit about the morals of doing wrong, which he rarely does in the manga series.